#include <stdio.h>

char map[10000][10000];

int main()
{
  int a, b, c, d, cnt, H, i, j, W;
 
  while (scanf("%d %d", &W, &H) != EOF)
    {
      for (i=0; i<W; i++)
	for (j=0; j<H; j++)
	  map[i][j] = 'N';
      while (1) 
	{
	  scanf("%d %d %d %d", &a, &b, &c, &d);
	  if (a==0 && b==0 && c==0 && d==0)
	    break;
	  for (i=c; i<c+a; i++)
	    for (j=d; j<d+b; j++)
	      map[i][j] = 'Y';
	}
      
      cnt = 0;
      for (i=0; i<W; i++)
	for (j=0; j<H; j++)
	  if (map[i][j] == 'N')
	    cnt++;
      printf("Floor has %d area not covered\n", cnt);
    }
  return 0;
}